drowdude said:
It allows it if you view "regular action" as meaning an action you can normally take in a round, such as a move-equivalent or attack action.
I do not think that is a reasonable interpretation of regular action. It says "your regular action", not "any of your regular actions". It's singular, which means it's referring to a single normal action.
Under the core rules, you can normally only take a single action per round, and that is a Standard Action or a Full Round Action. Every other action is a subset of one of those two, and is thus not a "normal" action.
That would allow the combo he suggets in his response.
Unless he explains it better than he did, I simply don't accept it. As I said, I e-mailed him specifically on this issue, and his only response was that Expert Tactician wasn't triggered twice. Since it seems clear that is was triggered twice, I can only conclude that he really didn't read my question, or didn't bother to look up the answer he gave in Sage Advice before replying to me.
In either case, despite my normal respect for the Sage, enough doubt has been raised that I can't accept his answer for this issue. I generally accept the Sage's responses, but I will not do so blindly, especially when he contradicts himself like that.